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采用基于有效应力原理的β法结合具体工程的试桩结果进行分析,揭示了基坑开挖导致坑底试桩极限承载力降低的内在原因,认为开挖段侧摩阻力的影响只是二者承载力差异的次要因素,更主要原因是桩顶截断标高所在平面以上未开挖土层在桩周土中产生的附加应力的影响。这种影响不仅体现在基坑开挖深度对承载力差异的影响上,也体现在基坑开挖宽度及桩基在基坑中的位置对承载力差异的影响上。
Based on the effective stress theory β method combined with the concrete engineering results of the test pile analysis to reveal the inherent reason that the foundation pit excavation led to the reduction of the ultimate bearing capacity of the pit bottom pile test, The main reason for the difference in force is mainly due to the additional stress generated in the soil surrounding the piles by the unexploited soil above the plane where the pile top cutoff elevation is located. This effect is not only reflected in the impact of excavation depth on the difference of bearing capacity, but also in the influence of the excavation width of foundation pit and the position of pile foundation in the pit on the difference of bearing capacity.